Finding the Third Proportional to 939.50 and 1,421.50

Step by Step Solution

1. Step 1: Write the proportion equation
   939.50 : 1,421.50 = 1,421.50 : x
2. Step 2: Convert to fraction form
   939.50/1,421.50 = 1,421.50/x
3. Step 3: Cross multiply
   939.50x = 1,421.50 × 1,421.50
4. Step 4: Simplify right side
   939.50x = 2,020,662.25
5. Step 5: Solve for x
   x = 2,020,662.25/939.50
6. Step 6: Final answer
   x = 2,150.78